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Date: Mon Jul 09 2007 - 18:32:13 CDT

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        WinPcap NPF.SYS Privilege Elevation Vulnerability PoC exploit
        -------------------------------------------------------------

        Affected software:

        (*) WinPcap versions affected (Confirmed)
        
        - WinPcap 3.1
        - WinPcap 4.1

    (*) Operating systems affected (Confirmed)
        
        - Windows 2000 SP4 (Both server and workstation)
        - Windows XP SP2
        - Windows 2003 Server
        - Windows Vista !!

        Description:

        It's a well known issue that WinPcap security model allows non-administrator
        users to use its device driver. If they don't manually unload it after using
        tools such as Wireshark (ethereal), which unfortunatelly oftenly happens, this
        can lead to unwanted network traffic sniffing and now with the help of this
        exploit to kernel mode code execution ;-)
        
        Remarks:
        
        The exploit code is a PoC and was tested only against Windows XP SP2, with minor
        modifications (delta offsets and changing VirtualAlloc for NtAllocVirtualMemory due
        to base address restrictions in Windows Vista ) should work on all OSes commented
        above.

        To test the PoC, just pick any software which uses WinPcap like WireShark, then
        start to sniff in any iface and close it (so WinPcap device gets up ). Run the
        exploit code (as guest user if you want) you should hit an int 3 in kernel mode :-)
                        
        Vulnerability discovered by:
        
        Mario Ballano Bárcena, mballano[_at_]gmail.com
        
You can download exploit and analysis at : http://www.48bits.com/exploits/npfxpl.c

Best regards,

Mario

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